Building images in CI pipeline in Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to build a Docker image named 'myapp' using the Dockerfile in the current directory.

Docker

docker build -t myapp [1] Dockerfile .

Drag options to blanks, or click blank then click option'

A-f

B-d

C-b

D-p

Attempts:

3 left

💡 Hint

Common Mistakes

Using -d which is for detached mode in other commands.

Using -p which is for port mapping.

Using -b which is not a valid Docker build option.

The -f option specifies the Dockerfile to use. Here, it points to the current directory's Dockerfile.

2fill in blank

medium

Complete the command to push the Docker image 'myapp' to the Docker Hub repository 'username/myapp'.

Docker

docker [1] username/myapp

Drag options to blanks, or click blank then click option'

Arun

Bpull

Cbuild

Dpush

Attempts:

3 left

💡 Hint

Common Mistakes

Using pull which downloads images.

Using run which starts containers.

Using build which creates images locally.

The docker push command uploads your image to a remote repository like Docker Hub.

3fill in blank

hard

Fix the error in the GitHub Actions step to build a Docker image with tag 'latest'.

Docker

      - name: Build Docker image
        run: docker build -t myapp[1] .

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A-latest

B:latest

C latest

D/latest

Attempts:

3 left

💡 Hint

Common Mistakes

Using a dash - instead of colon.

Adding a space before the tag.

Using a slash / which is for repository names.

Docker image tags use a colon : before the tag name, like :latest.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps branch names to their Docker image tags, only for branches starting with 'release'.

Docker

images = {branch: branch[1] 'v1' for branch in branches if branch.[2]('release')}

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A+

B==

Cstartswith

Din

Attempts:

3 left

💡 Hint

Common Mistakes

Using == instead of startswith for string prefix check.

Using in which checks substring anywhere.

Using - or other operators instead of + for string join.

The + operator joins strings. The startswith method checks if a string begins with another string.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps service names (uppercase) to their version numbers, only if version is greater than 0.

Docker

service_versions = { [1]: [2] for [3], version in services.items() if [2] > 0}

Drag options to blanks, or click blank then click option'

Aname.upper()

Bversion

Cname

Dservice

Attempts:

3 left

💡 Hint

Common Mistakes

Using service instead of name as loop variable.

Not converting name to uppercase.

Using wrong variable names causing errors.

name.upper() converts the service name to uppercase for the key. version is the value. name and version come from iterating services.items().